<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="button" value="按钮" onclick="f1()">
<script>
  //1.无参无返回值
  function f1() {
    console.log("f1")
  }
  f1();
  //2.有参无返回值
  function f2(name,age) {
    console.log(name+":"+age)
  }
  f2("潘虹",23);
  //3.无参有返回值
  function f3() {
    return "这是有返回值"
  }
  let info=f3();
  console.log(info)

  function f4(x,y) {
    return x*y;
  }
  let result = f4(8,9);
  console.log(result)

  //第二种声明方法的方式
  let f5 = function (name, age) {
    console.log(name+":"+age);
  }
  f5("张",25)

  //第三种声明方法的方式

  let f6 = new Function("name","age","console.log(name+':'+age)");
  f6("灭霸",1000)
</script>
</body>
</html>